초록 ▼

A pumping apparatus is provided for dispensing fluid material which comprises a fluid material supply container and a pump for conducting the fluid material from the container to a dispensing head. A controller receives data from a sensor in the container which identifies fluid material type. A pres

A pumping apparatus is provided for dispensing fluid material which comprises a fluid material supply container and a pump for conducting the fluid material from the container to a dispensing head. A controller receives data from a sensor in the container which identifies fluid material type. A pressure sensor in the dispensing head is used by the controller to continuously monitor fluid pressure and to control the flow rate by adjusting the application of current to electromagnetic coils which rotate an impeller in the pump. A timing device is used by the controller to measure the fluid flow rate. The controller adjusts the flow rate to a preprogrammed rate corresponding to the fluid material type by changing the position of pressure plates with respect to the impeller. A dispensing head is provided for applying joint compound to a wallboard joint. A water based composition for a joint compound is provided which comprises a pure gypsum plaster, an aliphatic resin glue and water, but no added alcohol or abrasive fillers.

대표청구항 ▼

[ What is claimed is:] [1.] A dispensing apparatus for providing a continuous supply of fluid material and for applying a substantially smooth layer of the fluid material onto a surface, said apparatus comprising:a supply container, for containing a fluid material;a pump having a pump impeller, and

[ What is claimed is:] [1.] A dispensing apparatus for providing a continuous supply of fluid material and for applying a substantially smooth layer of the fluid material onto a surface, said apparatus comprising:a supply container, for containing a fluid material;a pump having a pump impeller, and a fluid material inlet and outlet, said inlet being connected to said supply container for receiving the fluid material;a dispensing device connected to said pump outlet for dispensing the fluid material, said dispensing device comprising:a body having a main fluid inlet coupled to said outlet of said pump;a tape dispensing device coupled to said body and including a roller for receiving tape from a tape supply and for pressing the tape onto a planar surface as the tape is dispensed;said body having a first fluid passage connected to said main fluid inlet and having a dispensing outlet adjacent said roller for dispensing the fluid onto a bottom surface of the tape;an adjustable diverter valve positioned in said first fluid passage for selectively adjusting flow of the fluid through said first passage and for adjusting the dispensing of the fluid onto said bottom surface of said tape;said body further having an accumulation chamber having an open bottom end for dispensing the fluid material onto a top surface of the tape after the tape is pressed onto the planar surface, at least one second fluid passage connected to said main fluid inlet and to said accumulation chamber for supplying the fluid material to said accumulation chamber;a pressure sensor disposed in said dispensing device, for continuously sensing fluid material pressure in said dispensing device; anda processing device connected to said pressure sensor and to said pump, for continuously monitoring fluid pressure at said dispensing device and for adjusting the application of current to electromagnetic coils that operate at least in part to rotate said impeller thereby adjusting the fluid output of said pump in relation to said fluid pressure at said dispensing device.